<vue-tags-input
  v-model="tag"
  :tags="tags"
  @tags-changed="newTags => tags = newTags"
  @before-adding-tag="obj => handlers.push(obj.addTag)"
/>
<div v-if="handlers.length">
  <button @click="cancel">Cancel</button>
  <button @click="add">Add</button>
</div>
